In Toussaint, Montana, the townsfolk host a going away party for a family who owned a ranch for over a century, but forced to sell to the well funded The Host of Yahwah. A white priest leads the cult and decrees his followers will be picked up by alien spaceships just before the world is destroyed.

Gabriel DuPre learns through his FBI contacts that seven men who left the cult were all killed on the same day at the same time in various places around the country by female members. Gabriel tries to help a woman trying to escape but when she sees that members of the cult are about to capture her, she kills herself in front of her children. When Gabriel sneaks into the compound and sets fire to an ammunitions dump, the resulting explosions are enough to get the FBI involved. The FBI surrounds the compound but nobody wants another Waco so the Federal agents are prepared to wait them out until Gabriel comes up with an idea to break the back of the resistance.

The tenth installment in this series is refreshingly original due in large part to the protagonist who though a grandfather fourteen times over, lives life to the fullest. He is not afraid to take chances and puts his life on the line to try and get some information on the cult that can be used by the FBI. In BADLANDS the federal agents are the good guys who act with restraint while the cult members pursue their sinister agenda. Peter Bowen does for Montana what Tory Hillerman does for New Mexico.